Modular Synthetic Approach to Silicon-Rhodamine Homologues and Analogues via Bis-aryllanthanum Reagents
作者:Alexey N. Butkevich
DOI:10.1021/acs.orglett.1c00512
日期:2021.4.2
A modular syntheticapproach toward diverse analogues of the far-red fluorophore silicon-rhodamine (SiR), based on a regioselective double nucleophilic addition of aryllanthanum reagents to esters, anhydrides, and lactones, is proposed. The reaction has improved functional group tolerance and represents a unified strategy toward cell-permeant, spontaneously blinking, and photoactivatable SiR fluorescent
提出了一种基于芳基镧试剂与酯、酸酐和内酯的区域选择性双亲核加成的远红荧光团硅罗丹明(SiR)的多种类似物的模块化合成方法。该反应提高了官能团耐受性,代表了一种针对细胞渗透、自发闪烁和光激活 SiR 荧光标记的统一策略。它与钯催化的羟基或氨基羰基化相结合,为一系列经过验证的活细胞兼容荧光染料提供了一条简化的合成途径。
Expedient Synthesis of <i>N</i>
-Methyl- and <i>N</i>
-Alkylamines by Reductive Amination using Reusable Cobalt Oxide Nanoparticles
作者:Thirusangumurugan Senthamarai、Kathiravan Murugesan、Kishore Natte、Narayana V. Kalevaru、Helfried Neumann、Paul C. J. Kamer、Rajenahally V. Jagadeesh
DOI:10.1002/cctc.201701617
日期:2018.3.21
the synthesis and functionalization of amines by using earth‐abundant metal‐based catalysts is of scientific interest. In this regard, herein we report an expedient reductive amination process for the selective synthesis of N‐methylated and N‐alkylated amines by using nitrogen‐doped, graphene‐activated nanoscale Co3O4‐based catalysts. Starting from inexpensive and easily accessible nitroarenes or amines
N-甲基和N-烷基胺代表重要的精细化学品和散装化学品,已广泛用于学术研究和工业生产中。值得注意的是,这些结构基序存在于大量生命科学分子中,并在调节其活动中起着至关重要的作用。因此,通过使用富含地球的金属基催化剂开发一种方便,经济高效的胺合成和官能化方法的研究具有科学意义。在这方面,我们在此报告了一种便捷的还原胺化工艺,该工艺通过使用氮掺杂的石墨烯活化的纳米级Co 3 O 4选择性合成N-甲基化和N-烷基化的胺。基于催化剂。从廉价且易于获得的硝基芳烃或胺和甲醛水溶液或存在甲酸的甲酸开始,这种经济高效的还原胺化方案可合成各种N-甲基和N-烷基胺,氨基酸衍生物和现有药物分子。
Ytterbium triflate promoted coupling of phenols and propiolic acids: synthesis of coumarins
作者:Serena Fiorito、Francesco Epifano、Vito A. Taddeo、Salvatore Genovese
DOI:10.1016/j.tetlet.2016.05.087
日期:2016.6
Coumarins are a well-known class of natural occurring and semi-synthetic products with reported important and effective pharmacological activities. In this Letter an improved method for the chemical synthesis of such compounds is described. Coumarins have been obtained in good to excellent yields under microwave irradiation and solvent-free conditions in a short time from differently substituted phenols
Method for the Fluorescent Detection of Nitroreductase Activity Using Nitro-Substituted Aromatic Compounds
申请人:Smaill Jeffrey B.
公开号:US20100173332A1
公开(公告)日:2010-07-08
A method utilising one or more fluorogenic probes, for the detection of nitroreductase activity. The non-fluorescent probes are reduced in the presence of nitroreductase to form fluorescent derivatives that may be detected using fluorescence spectroscopy. In particular, the method may be used to detect and/or identify a plurality of nitroreductase in a single test environment
boronate probes were detected under these conditions. Using the competition kinetics method and a set of HNO scavengers, the value of the second order rate constant of the HNO reaction with oxygen (k = 1.8 x 10(4) m(-1) s(-1)) was determined. The rate constant (k = 2 x 10(4) m(-1) s(-1)) was also determined using kinetic simulations. The kinetic parameters of the reactions of HNO with selected thiols, including
硝基的质子化一电子还原产物硝基氧(HNO)仍然是一个神秘的活性氮物质。其化学反应性和生物学活性仍未完全理解。HNO供体显示出与NO供体不同的生物学效应。尽管文献中描述了HNO与分子氧的反应性,但尚未明确鉴定该反应的产物。在这里,我们报告在有氧条件下在生理pH水溶液中HNO供体的分解导致形成过氧亚硝酸盐(ONOO(-))作为主要中间体。我们已经借助硼酸酯探针(例如香豆素7-硼酸或荧光素甲酯的4-硼烷苄基衍生物)专门检测和定量了ONOO(-)。除了主要的酚醛产品外,在这些条件下检测到过氧亚硝酸盐特定的硼酸盐探针氧化副产物。使用竞争动力学方法和一组HNO清除剂,确定了HNO与氧气反应的二级速率常数(k = 1.8 x 10(4)m(-1)s(-1))的值。速率常数(k = 2 x 10(4)m(-1)s(-1))也使用动力学模拟确定。报道了HNO与选定的硫醇,包括半胱氨酸,二硫苏糖醇,N-乙酰半